
// 三、TypeScript 断言
// 3.1 “尖括号” 语法
//  ​
//  let someValue: any = "this is a string";
//  let strLength: number = (<string>someValue).length;

// let myNmuber:Number =(<String>"abc").length;
// // 3.2 as 语法
// let myNmber2:Number=("abc" as string).length;

